Mechanical stoker.



w. R. WOOD; MECHANICAL STOKER. APPLICATION FILED APR. 28, 1913. Y \M I 1,087,155. Patented Feb. 17,1914;

3 sums-511mm 1.

I MEGHAN STOKER. APPLIOATION'PILED APB.28, 1913.

1508x155; Patented Feb. 17, 1914. I Q 3 SHEETS-SHEET 3.

WILFRED BOTHJBRY WOQD, OF LONDON, ENGLAND.

MECHANICAL s'roxnn.

. Specification of Letters Patent.

Application filed April 28, 1913. Serial R0. 164,131.

Patent ed Feb. 17, 1914.-

To all whom it may concern:

Be it known that I, WILFRED ROTHERY W00, a citizen of the United States of America, residing at London, England, have invented new and useful Improvements. Connection with Mechanical Stokers, of. which the following is a specification.

This invention relatesto that class of mechanical stokers in which the fuel is received on the grate at one side or end; and the refuse is discharged at the opposite side or end. Included in this class is what are known as the traveling rate or chain grate stokers. In this class 0 stoker difiiculty is sometimes experienced in securing complete combustion of the fuel before it reaches the end of the grate where the discharge takes place. v

Dams, bars, or chains, some of which have been fixed and others movable with relation to the grate, are sometimes used near the discharge end to obstruct the travel of the fuel so as to give more time for its complete combustion, but even with the movable class it has not been customary to remove thedam or bars away from the intense heat of the fire, and such dams or bars being constantly exposed to high temperatures are apt to burn away; and the further objection to their use is that with some fuels they cause the accumulation of clinkers to such an extent as'to destroy the full burning effectiveness of the grate. According to this invention not only are these difliculties overcome, but a greater agitation of'fuel at the discharge side -of the grate, and hence more completecombustion is secured. These re-' sults are obtained by giving the bar or dam a to and fro' movement-toward and away from the advancing fuel. In the forward movement it presses forward at the back end of the grate both the unburned fuel and refuse. The return movement is such as to remove the bar from the intense heat of the fire, and to such a osition as to permit of the refuse, accumlilated by the previous movement, to .be discharged either over or under the bar into the ash pit. Many me-, chanical movements may be employed to give the desired to and fro motion of the bar.

In the accompanying drawings the invention is illustrated as being applied to a traveling or chain Figure 1 is a side e evation partly in section;

Igrate stoker, and in same Fig. 2 a detached view showing the parts when the dam is withdrawn from the grate;

Fig. 3 a rear end elevation Fig. 4 a plan view of same; Fig. 5 shows one of the numerous other formswhich may be'employe'd for moving the dam to and fro; and Fig. 6 is a plan view of same.

In the drawings only so much of mechanism and furnace are shown as will enable the invention to be clearly followed Referring first to Figs. '1 to 4 it will be noted that mounted at the rear of the stoker and on either side of sametare arms 1 pivoted at 2 in bracket 3 throug n which passes inthis case the driven shaft 4 of the stoker. On the outer end of shaftA is a plate 5 carrying rollers 6 adapted as shaft 4: is revol-ved to make contact with the inclined sur faces 7 carried by arms 1. It will be seen that the rollers 6 and the inclined surfaces 7 forma species of cam which in turn imparts motion to the arm 1.

The dam is shown as consisting of a num.-, ber of sections 8 carried by arms 9 that termlna-te .at their outer ends in open sleeves 10 wh ch when arms 9 are held in a vertical positlon enable the sleeves to be slipped over the oval bar 11 and the bar 9 to be turned down so that its outer end can rest on the grate. are squared so as to be adapted to be held in elther of the recesses 12 at the top of arms 1 so that the point on the grate to which the dam 8 is to travel may be varied as desired.

The outer ends of the oval bar 11 The action of the parts heretofore described is as follows: As the driven shaft 4 revolves the rollers 6 alternately make contact with the inclined surfaces 7 and the arm 1 is rocked or caused to ,reciprocate so as to alternately travel onto the grate and push or bank up the ashes and clinker thereon and then to at once retire from the fire zone to a point say as indicated by dotted lines in Fig. 1 thus removing the outer ends 8 of the bars 9 from the intense burning action of the fire.

In Figs. 5 and 6 the dams 8 are mounted on a'cranked shaft 13 carried through the wall of thefurnace and capable of being rotated by any suitable means while a cross shaft or support 14 may be employed to prevent the dam from falling downwardly when in its retracted position. The action of thedam 8 is exactly the same as that books 121 the ashes eml clinker end reeires out of t e fire zone,

11; is obvious that numerous arrangements other then those illustratecl can be designed which will efl'ect the so enrl fro motion of the dam and that the invention may be aplied. to other classes of stokers than those in port illustrated arid that the (lam may be e continuous rigid be? or as flexible one so long as it is adapted to push or book up the traveling fuel -or ash and then retire from the zone of intense heat and permit the refuse or eventual ash to be clischerged.

What I claim. is v fl. In mechanical seekers emi in combination a. movable grate, edsm for banking up the fuel at the discharge encl thereof, means operem bytlm driving mechanism for sclvsncing ssid elem toward the advancing fuel and means 0 emted by the driving mechanism fOIYWlKllOlI'ilWlIlg seicl oem to e. posi tion free from the intense heel; of she lire.

2. In mechanicol stokers and in combinetion, s movable rate, a dem foribanking up the fuel oi; thedlscherge end thereof, means operet/edbythe movable grate for advance ing said dam, toward the ecivencing fuel and means operated by the movable greie for memes Withdrawing seicl dam to e position fires from the inlense heel; of the 3. In mechanical seekers midis combinotion, a movable grate, e (lam for honking up the fuel at the discharge end thereo fi s, so volving grate-operating shaft, pivotecl erms carrying the clam, zmcl e member: on said grate operating shaft for causing ssifl pie oted arms to rock and carry the dam towardthe advancing fuel and also to Withdraw said dam to a position free from the intense heat of she fire.

4. In mechanical stokers and in combine tion, a; movable grate, a demior banking up the fuel at the discharge end thereof, as revolving grate-operating shaft, pivoted arms carrying the dam, com surfaces on the aims and a cam member on the said shaft adapted to cooperate with the inclined surfaces to rock the pivoted arms.

In witness whereof I have hereunto set my hand in the presence of two subscribing Witmesses.

WILFRED ROTHERY 'WG QH.

Witnesses: HERBERT Cumulus Woonoem-T, Hem COTTAM.

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